720 XTF Search Results (expand=subject;f1-subject=Galaxy;f2-spectral-Type=X-ray);f1-subject%3DGalaxy;f2-spectral-Type%3DX-ray Results for your query: expand=subject;f1-subject=Galaxy;f2-spectral-Type=X-ray Thu, 01 Jan 1970 12:00:00 GMT M31 from Einstein. This picture taken by the Einstein Observatory points to the galactic center of M31 - the Andromeda Galaxy - the nearest spiral galaxy to our Milky Way galaxy. Using more than 150 observations carried out over 13 years by the Chandra X-ray Observatory, researchers in 2013 identified 26 black hole candidates, the largest number to date, in the Andromeda Galaxy. Thu, 01 Jan 1970 12:00:00 GMT